My DM-41 works without problems with the firmware version V25 and XYZALM, but also with the previous versions. I always use the HP-41 Ultimate Alarm Clock (UAC) from Geir Isene. I work with CLK24 and DMY on 12MHz.

DM42L version. Do not forget the annunciators in alpha mode. The reserve column can also be used as a hint that all annunciators can be seen by pressing (Shift) ANNUN. If the operators have to go left, they must be in the order '-', '+', '*' and '/'..... EDIT: x^2, NOT 2^x and some other corrections

Annuciators: Maybe three of them are sufficient. At the top left longer bar for 'multirow menus', at the bottom left longer bar for 'shift', at the middle left a short bar indicating that one of the 'other annuciators' is on or active (flashing). "x:" and "y:" can be made a little narrower. The left...

Here is a visualization of the affiliation of a label and the corresponding button with different colored bars. Of course, this maybe will not be accepted by the majority of potential customers. Personally, I would only be interested in a credit card calculator anyway. I like the DM42 as it is, I do...

@Dani R.: Hmmh, little surprise. But how do you want to implement menu keys? :P (BTW, even an US American keyboard should allow for a capital sigma. :roll: ) I was too lazy to look for the ASCII code for Sigma and I still am. I think I use the same keyboard layout as David and Michael. The menu key...

I am in with a credit card size model. ... OK, and which are the soft-buttons F1-F6? Back to the roots. F1 .. F6 are Sigma+ .. XEQ, therefore TOP.FCN is necessary again. SETUP is now on the ALPHA-button (new added). O.K. the buttons does not correspondent to the display. Some drawing lines may help.

The update to 3.2 with dm_tool 2.3 was smooth but then I tried to transfer some OFFIMG files and it hung. The DM42 was unresponsive, stuck in USB disk mode, but not anymore recognized by Windows. I had to reset it with a paperclip, then everything worked fine and I was able to transfer the images. ...